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Phototransduction and clock gene expression in the troglobiont beetle Ptomaphagus hirtus of Mammoth caveFriedrich, Markus ...Obligatory cave species exhibit dramatic trait modifications such as eye reduction, loss of pigmentation and an increase in touch receptors. As molecular studies of cave adaptation have largely ... concentrated on vertebrate models, it is not yet possible to probe for genetic universalities underlying cave adaptation. We have therefore begun to study the strongly cave-adapted small carrion beetle Ptomaphagus hirtus. For over 100 years, this flightless signature inhabitant of Mammoth Cave, the worldćs largest known cave system, has been considered blind despite the presence of residual lens structures. Bydeep sequencing of the adult head transcriptome, we discovered the transcripts of all core members of the phototransduction protein machinery. Combined with the absence of transcripts of select structural photoreceptor and eye pigmentation genes, these data suggest a reduced but functional visualsystem in P. hirtus. This conclusion was corroborated by a negative phototactic response of P. hirtus in lightždark choice tests. We further detected the expression of the complete circadian clock gene network in P. hirtus, raising the possibility of a role of light sensation in the regulation of oscillating processes. We speculate that P. hirtus is representative of a large number of animal species with highly reduced but persisting visual capacities in the twilight zone of the subterranean realm. These can now be studied on a broad comparative scale given the efficiency of transcript discovery by next-generation sequencing.Source: Journal of Experimental Biology [Elektronski vir]. - ISSN 0022-0949 (Vol. 214, 2011, str. 3532-3541)Type of material - article, component part ; adult, seriousPublish date - 2011Language - englishCOBISS.SI-ID - 2449743
Author
Friedrich, Markus |
Chen, Rui |
Daines, Bryce |
Bao, Riyue |
Caravas, Jason |
Rai, Puneet K. |
Zagmajster, Maja |
Peck, Stewart B.
Topics
biospeleology |
cave adaptation |
circadian clock |
phototransduction |
evolution
source: Journal of Experimental Biology [Elektronski vir]. - ISSN 0022-0949 (Vol. 214, 2011, str. 3532-3541)
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Friedrich, Markus | |
Chen, Rui | |
Daines, Bryce | |
Bao, Riyue | |
Caravas, Jason | |
Rai, Puneet K. | |
Zagmajster, Maja | 23478 |
Peck, Stewart B. |
Source: Personal bibliographies
and: SICRIS
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